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stiv31 [10]
3 years ago
9

Object a has a mass of 20 g

Physics
1 answer:
Anarel [89]3 years ago
7 0
And.. where is the rest of the question?
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if a car travels 30 miles north for one half hour, 50 miles east for one hour, and 30 miles south for 30 minutes, what is the to
egoroff_w [7]
50 miles east. because the 30 miles north then south cancel each other out. 
5 0
3 years ago
Read 2 more answers
One way for a family to determine their energy use is by analyzing their electric bill each month. Most energy bills include a g
strojnjashka [21]

Answer:

C)Before leaving for their trip, turn the central heating system off, along with lights and electrical household appliances.

Explanation:

Although, the other three options will also reduce their electricity bill but they do not explain why Mr. Hernandez's family got same electricity bill as last year even though this time they were not home for one and a half week. Also, A), B) and D) ideas are not reasonable.

So, the only conclusion is that even when they were on a vacation. the electrical appliances in their home were on. That's why the bill remained the same.

The idea of turning the central heating system off, along with lights and electrical household appliances before they leave for the trip will help reduce the energy usage. Also, it is reasonable.

4 0
3 years ago
A test model for a new experimental gasoline engine does 45 J of work in one cycle for every 76 J of heat it takes in. What is t
kherson [118]

Answer:

The efficiency of the engine is 59.2%.

Explanation:

We have,

Work done by the gasoline engine is 45 J and the for every 76 J of heat it takes in.

It is required to find the efficiency of the engine. Efficiency of the engine is given by the ratio of work done to the heat taken i. Its formula is given by :

\eta=\dfrac{W}{Q}\\\\\eta=\dfrac{45}{76}\\\\\eta=0.592\\\\\eta=59.2\%

So, the efficiency of the engine is 59.2%.

3 0
3 years ago
Which is one physical property that all stars have
UNO [17]

Answer:

Star characteristics consider physical characteristics such as stellar mass, size, surface temperature, and luminosity .

6 0
2 years ago
A hammer taps on the end of a 4.00-m-long metal bar at room temperature. a microphone at the other end of the bar picks up two p
Nezavi [6.7K]
<span>Length that is distance s = 4.00m
 Speed of sound in air V = 343 m/s
 Time for metal = 11.0ms = 0.011
 Calculating the time t = s / V = 4 / 343 = 0.01166s
 Time for the sound in the metal = 0.01166 - 0.011 = 0.00066 = 6.6 x 10^-4s Speed of sound in metal Vm = 4 / 6.6 x 10^-4 = 6.060 x 10^3 m/s</span>
4 0
3 years ago
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